X-Git-Url: http://git.veekun.com/zzz-pokedex.git/blobdiff_plain/b3b3285a703226e551e34a89e59a0c6c4e97b16f..refs/tags/veekun-promotions/2011041501:/pokedex/__init__.py diff --git a/pokedex/__init__.py b/pokedex/__init__.py index 1e6c6d1..e69de29 100644 --- a/pokedex/__init__.py +++ b/pokedex/__init__.py @@ -1,209 +0,0 @@ -# encoding: utf8 -import sys - -from sqlalchemy.exc import IntegrityError -import sqlalchemy.types - -from .db import connect, metadata, tables as tables_module -from pokedex.lookup import lookup as pokedex_lookup - -def main(): - if len(sys.argv) <= 1: - help() - - command = sys.argv[1] - args = sys.argv[2:] - - # Find the command as a function in this file - func = globals().get("command_%s" % command, None) - if func: - func(*args) - else: - command_help() - - -def command_csvimport(engine_uri, directory='.'): - import csv - - from sqlalchemy.orm.attributes import instrumentation_registry - - session = connect(engine_uri) - - metadata.create_all() - - # SQLAlchemy is retarded and there is no way for me to get a list of ORM - # classes besides to inspect the module they all happen to live in for - # things that look right. - table_base = tables_module.TableBase - orm_classes = {} # table object => table class - - for name in dir(tables_module): - # dir() returns strings! How /convenient/. - thingy = getattr(tables_module, name) - - if not isinstance(thingy, type): - # Not a class; bail - continue - elif not issubclass(thingy, table_base): - # Not a declarative table; bail - continue - elif thingy == table_base: - # Declarative table base, so not a real table; bail - continue - - # thingy is definitely a table class! Hallelujah. - orm_classes[thingy.__table__] = thingy - - # Okay, run through the tables and actually load the data now - for table_obj in metadata.sorted_tables: - table_class = orm_classes[table_obj] - table_name = table_obj.name - - # Print the table name but leave the cursor in a fixed column - print table_name + '...', ' ' * (40 - len(table_name)), - sys.stdout.flush() - - try: - csvfile = open("%s/%s.csv" % (directory, table_name), 'rb') - except IOError: - # File doesn't exist; don't load anything! - print 'no data!' - continue - - reader = csv.reader(csvfile, lineterminator='\n') - column_names = [unicode(column) for column in reader.next()] - - # Self-referential tables may contain rows with foreign keys of other - # rows in the same table that do not yet exist. Pull these out and add - # them to the session last - # ASSUMPTION: Self-referential tables have a single PK called "id" - deferred_rows = [] # ( row referring to id, [foreign ids we need] ) - seen_ids = {} # primary key we've seen => 1 - - # Fetch foreign key columns that point at this table, if any - self_ref_columns = [] - for column in table_obj.c: - if any(_.references(table_obj) for _ in column.foreign_keys): - self_ref_columns.append(column) - - for csvs in reader: - row = table_class() - - for column_name, value in zip(column_names, csvs): - column = table_obj.c[column_name] - if column.nullable and value == '': - # Empty string in a nullable column really means NULL - value = None - elif isinstance(column.type, sqlalchemy.types.Boolean): - # Boolean values are stored as string values 0/1, but both - # of those evaluate as true; SQLA wants True/False - if value == '0': - value = False - else: - value = True - else: - # Otherwise, unflatten from bytes - value = value.decode('utf-8') - - setattr(row, column_name, value) - - # May need to stash this row and add it later if it refers to a - # later row in this table - if self_ref_columns: - foreign_ids = [getattr(row, _.name) for _ in self_ref_columns] - foreign_ids = [_ for _ in foreign_ids if _] # remove NULL ids - - if not foreign_ids: - # NULL key. Remember this row and add as usual. - seen_ids[row.id] = 1 - - elif all(_ in seen_ids for _ in foreign_ids): - # Non-NULL key we've already seen. Remember it and commit - # so we know the old row exists when we add the new one - session.commit() - seen_ids[row.id] = 1 - - else: - # Non-NULL future id. Save this and insert it later! - deferred_rows.append((row, foreign_ids)) - continue - - session.add(row) - - session.commit() - - # Attempt to add any spare rows we've collected - for row, foreign_ids in deferred_rows: - if not all(_ in seen_ids for _ in foreign_ids): - # Could happen if row A refers to B which refers to C. - # This is ridiculous and doesn't happen in my data so far - raise ValueError("Too many levels of self-reference! " - "Row was: " + str(row.__dict__)) - - session.add(row) - seen_ids[row.id] = 1 - session.commit() - - print 'loaded' - -def command_csvexport(engine_uri, directory='.'): - import csv - session = connect(engine_uri) - - for table_name in sorted(metadata.tables.keys()): - print table_name - table = metadata.tables[table_name] - - writer = csv.writer(open("%s/%s.csv" % (directory, table_name), 'wb'), - lineterminator='\n') - columns = [col.name for col in table.columns] - writer.writerow(columns) - - primary_key = table.primary_key - for row in session.query(table).order_by(*primary_key).all(): - csvs = [] - for col in columns: - # Convert Pythony values to something more universal - val = getattr(row, col) - if val == None: - val = '' - elif val == True: - val = '1' - elif val == False: - val = '0' - else: - val = unicode(val).encode('utf-8') - - csvs.append(val) - - writer.writerow(csvs) - -def command_lookup(engine_uri, name): - # XXX don't require uri! somehow - session = connect(engine_uri) - - results, exact = pokedex_lookup(session, name) - if exact: - print "Matched:" - else: - print "Fuzzy-matched:" - - for object in results: - print object.__tablename__, object.name - - -def command_help(): - print u"""pokedex -- a command-line Pokédex interface - - help Displays this message. - lookup {uri} [name] Look up something in the Pokédex. - - These commands are only useful for developers: - csvimport {uri} [dir] Import data from a set of CSVs to the database - given by the URI. - csvexport {uri} [dir] Export data from the database given by the URI - to a set of CSVs. - Directory defaults to cwd. -""".encode(sys.getdefaultencoding(), 'replace') - - sys.exit(0)